[c99] fix grammar rule to parse structs
[c99] fix grammar rule to parse structs

have # directives skipped for now through whitespace rule. not sure how to handle preprocessor; inline or as a separate parser.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@26061 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot